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This bike runs great all the way from 0mph - 38mph, no 4 stroking, no hesitation, pulls hard. I believe I'm getting everything out of this motor that it has. The problem is it will only do it without the air filter. Even using just one layer of panty hose with a rubber band for an air filter it drops 5 mph and 4 strokes. My question is, is there anyway I can get 38 mph and run a GOOD air filter? If you need anymore information just ask. Thanks.

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Might try that. I'm running a Speed carb now with 66 jet, c-clip full rich & a 4'' long exhaust. Got 40mph going both directions on level blacktop. I realize this isn't good for my motor. Just want to find out how much can be gotten out of a stock motor without spending money on it. But I did have to buy a complete set of jets. I would like to be able to hit 40mph with a Good air filter & a semi quiet exhaust. I doubt I will be able to realize my goal. But hey, never hurts to try! Thanks for the advice VMB!

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38 out of a completely stock setup is pretty good. I wouldn't worry about the max speed. I'd worry more about max longevity. Iv had a few kits only last 100 miles before seizing up lol. Back when I was 16 and loved hitting wide open without a idle screw haha. It ran lean....

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After about the 15th engine destroying itself in another various way, I began to realize that these little engines were not meant to be primary transportation and a racecar lol. One must have both a put put bike and a experimental race bike to be satisfied in riding these. My favorite engine detonation was when A roller bearing broke and tossed bearings into the cylinder, Swiss cheesing both the head and piston but some how it kept running at much less power. I rode that engine out for another 80 miles before a piston ring broke and scarred the cylinder, but man it was a die hard lol.

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I had the same issue. My stock air filter fell off and it felt like it had a turbo so I knew it needed a better flowing filter. I ended up modding a foam uni foam filter from a Honda ruckus and it runs just like it did without a filter

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I had the same issue. My stock air filter fell off and it felt like it had a turbo so I knew it needed a better flowing filter. I ended up modding a foam uni foam filter from a Honda ruckus and it runs just like it did without a filter

Well-Known Member

As Norm said jet down and it should run correct with the air filter, be sure and keep an eye on the spark plug color to keep from going too lean. lean makes heat, heat melts parts, engines seize, rear tire locks up, wait I may be telling too much. Don't ask how i know!